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4-bit Shift register with flip flop

I want to build a 4-bit shift register using D FlipFlop , but I don't understand this diagram. This code is given to me for shift register ENTITY shift4 IS PORT ( D : IN STD_LOGIC_VECTOR(3 DOWNTO 0) ; Enable : IN STD_LOGIC; Sin : IN STD_LOGIC; Clock : IN...

Galois LFSR - how to specify the output bit number

I am trying to understand how change the galois LFSR code to be able to specify the output bit number as a parameter for the function mentioned below. I mean I need to return not the last bit of LFSR as output bit, but any bit of the LFSR (...